Author: wudejian

Mr. Liu, who manufactures liquid silicone rubber products, came to purchase Yuhui YH136 mold steel and told me, “We’re familiar with the performance advantages of your YH136. Many of our peers have used it to solve the problems of pitting and poor surface finish that occur when polishing standard S136 mold steel.”  Everyone has their own…

On Monday, as soon as I got to work, I received a bank transfer from Mr. Ying for 10 pieces of heat-resistant steel 8433. Seeing such a large order come in immediately lifted my spirits.  Since last June, Mr. Ying has been placing orders for heat-resistant steel 8433 from time to time, usually in batches…

A customer purchasing cold-forging dies for IGBT copper heat sinks has once again placed an order with Yuhui for 24 pieces of high-toughness LG die steel.  Behind every customer lies a story. This customer manufactures cold-forging dies for IGBT red copper heat sinks. Clients in this industry typically have substantial financial resources. Even the smallest…

If you’re making a die with a TD coating, I strongly advise against using Cr12MoV tool steel—the chances of failure are very high.  I just received an inquiry from a user: they bent 5mm duplex stainless steel into a W-shape using a Cr12MoV die with a TD coating costing 80 yuan per kilogram, but after stamping…

At noon today, an “uninvited guest” showed up. Luckily, I was at the factory; otherwise, he would have come by for nothing again.  Just before 12:00 p.m., I received a call from Mr. Su. He said the die for cold extrusion of 6-series aluminum had cracked, bringing production to a halt. A friend had told…

A customer just came in to purchase 8503 mold steel for a non-stick application—nylon with 30% glass fiber—with a requirement of 1 million cycles.  The original molds used H13 and SKD61, but they started developing flash after producing just over 100,000 parts; this problem has been an ongoing issue for quite some time.  Mr. Zhong’s feedback once…

A netizen asked: For nickel-plated steel sheets with a thickness of 0.12–0.18, what type of steel is most durable for high-speed stamping at a speed of 300?  When stamping nickel-plated steel strips, the nickel coating on the surface can easily cause the material to stick to the die, leading to adhesive wear on the die…

A netizen asked, “What are the common grades of plastic mold steel?”  Commonly used plastic mold steels are divided into three categories: pre-hardened plastic mold steel, rust-resistant plastic mold steel, and high-hardness plastic mold steel.  (1) Pre-hardened plastic mold steel is steel that has already been quenched and tempered by the steel mill to the desired hardness…

“What type of tool steel should be used for drawing dies to prevent wire marks?” This has been a frequently asked question recently in live streams and by online users. Some people use Cr12MoV+TD or other coatings for their drawing dies, but string marks appear after producing only a few parts. Others even use DC53 with…

A copper die-casting factory once again purchased 25 pieces of heat-resistant steel 8433 from Yuhui for use in its copper die-casting molds.  The temperature of molten copper in copper die casting reaches 900°C, which exceeds the annealing temperature of die steel. Die steel with poor heat resistance is prone to annealing. Once annealed, it loses its red…

Many people think that 8566 die steel is a standard grade that can be purchased anywhere, but those who have used fourth-grade 8566 die steel and compared it to Yuhui’s 8566 chipping-resistant steel have deeply regretted their choice.  Mr. Li was using 4.0 hot-rolled sheet for forming. He had originally purchased a fourth-grade 8566 steel at 109…

After two months of testing six types of mold steel and making six phone calls—and still unable to find a solution—Mr. Zhou came yesterday to purchase high-toughness LG die steel. It really wasn’t easy.  Mr. Zhou works with cold heading dies for forging red copper. He first contacted me in early June. His die was made of…